Editing Dc (computer program) (section)

==History==
dc is the oldest surviving [[Unix]] language program. When its home [[Bell Labs]] received a [[PDP-11]], dc{{em dash}}written in [[B (programming language)|B]]{{em dash}}was the first language to run on the new computer, even before an assembler.<ref name="reader">{{cite tech report |first1=M. D. |last1=McIlroy |authorlink1=Doug McIlroy |year=1987 |url=http://www.cs.dartmouth.edu/~doug/reader.pdf |title=A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986 |series=CSTR |number=139 |institution=Bell Labs}}</ref> [[Ken Thompson]] has opined that dc was the very first program written on the machine.<ref name="KenThompson">{{cite AV media|url=https://www.youtube.com/watch?v=EY6q5dv_B-o|people=Brian Kernighan and Ken Thompson|title=
A nerdy delight for any Vintage Computer Fest 2019 attendee: Kernighan interviewing Thompson about Unix|accessdate=September 3, 2019|publisher=YouTube|time=29m45s}}</ref>